Here's the original article, deleted but still in Archive

"Four workers of the State Meteorological Agency confessed that planes are spreading lead dioxide, silver iodide and diatomite throughout Spain"

https://web.archive.org/web/20211001040057/https://www.alertadigital.com/2021/09/28/cuatro-trabajadores-de-la-agencia-estatal-de-meteorologia-confesaron-que-aviones-estan-esparciendo-por-toda-espana-dioxido-de-plomo-yoduro-de-plata-y-diatomita/

Probably debunked fake news though